Question about Rinnai RHFE-1004FA 38,400 BTU Energy Saver Ductless Heater - Natural Gas

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Rinnai 1004 heats to a temp 4 degrees higher than set temp, adjustment?

Rinnai 1004 heats to a temp 4 degrees higher than set temp. It seems to be consistent. Can I adjust or calibrate the set or the temp reading with a screw adjustment or othewise?

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  • lynmyers Sep 23, 2008

    My Rinnai 1004 heats to a temp four degrees higher than what we set it at, consistently. We should be able to adjust this. Where is adjustment and how can I adjust?

  • Anonymous Mar 22, 2014

    I'm trying to remove the front panel (cleaning out the dust) but there's a grill screw that is too stubborn to remove. I'm afraid if I use brute force I will damage it. Are some screws special that only screw half way ? It seems like something is attached behind it.

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You can adjust the position of the room air sensor found on the back of the unit between the heater and the wall. It is a black rubber bulb with yellow wires. There is a few inches of extra wire you can extend higher to get a more accurate reading of room air. While you are back there, check for drafts that will give you false readings.

Posted on Sep 24, 2008

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When the temp drops below 10degrees our Rinnai


rinnai has a technical bulletin out on this condition #28. It instructs the technician to adjust the gas pressure. You can get a copy of this bulletin by contacting rinnai at 800-621-9419 (US). or at rinnai.us

Feb 02, 2010 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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Have a 1004fa model to heat a room. temp on


You may have a bad circuit board. Depending upon the age of the heater it may still be under warranty. Contact Rinnai (in US) 800-621-9419 with your serial number and installation date. Ask if they can offer a solution. Good Luck!

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Rinnai 1004F Heating the Outdoors!


Do you have the Economy button on? If so, and you have a large space to heat or the outside temp is very cold the unit may not be able to keep up. If this is the case the stove runs forever, trying to reduce the temp by 2 degrees every 30 minutes. This may not work for your space and outside temp.

Your ideas about the intake and exhaust are not quit right. There is a fan that pulls air from outside over the outside of the exhaust pipe (to preheat it). This fan actually pushed the combustion gasses all the way out the exhaust. The exhaust exiting should be a little hot. In very cold temps, frost can build up around the air intake, which is right around the exhaust pipe. If you see this you will need to keep it clean. It is a good idea to look at the exhaust everyday when it really cold.

Good luck,

Tom Hawkins
Bethel, Alaska
hawkins111@gci.net

Jan 10, 2009 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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Temperture bulb


A temp bulb will is only accurate to plus or minus 10 degrees sometimes as much a 20 degrees the ideal place for the bulb is in the intake air flow the bulb comes with a line that is long enough for this application

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Rinnai 1004 - Temp on thermostat reads 10 deg cooler than actual, keeps running


Behind the unit near the floor level, is a yellow wire with a black bulb at the end. This is the actual sensor for returning air. If there is cool air infiltrating the area where it is located, it will keep the unit running until the return air reaches temperature. You could also have a bad sensor but highly unlikely. Make sure there is no air infiltration influencing the sensor. Also, you can unclip the sensor and pull out a few more inches of wire to locate it higher up away from the floor. Tie it up with a wire tie.

Rinnai it testing a remote thermostat but as of yet, there is no plans to offer one.

Nov 24, 2007 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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Power reset - Rinnai 1004


the rinnai is like a monitor. just unplug it, wait five min and plug it back in. then radjust your temp set point and it should pick back up. when there is a power outage the led-s flash 88:88

Nov 17, 2007 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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